[GTK4] Double click registers as one DOWN and two UP events instead of two of each

[joel-majano]

Run Snippet 62 in GTK4 then double click in the window. You will see a lot of move events, and then one single "DOWN" event followed by two "UP" events. There should be two of each in the "DOWN, UP, DOWN, UP" sequence which can be obtained when using this snippet in GTK3.

Environment: Fedora 36, GTK 4.6.5, Wayland, OpenJDK17

Tracked in #228

[lathapatil]

@joel-majano how do I switch between gtk3 and gtk4 to test snippet '62? I have setup SWT workspace from oomph in Eclipse IDE for Committers

Currently I am able to get "DOWN, UP, DOWN, UP" sequence on double click. I have built native binaries using gtk4
./build.sh -gtk4 install

[akurtakov]

@lathapatil start the snipped with SWT_GTK4=1 env variable.

[lathapatil]

start the snipped with SWT_GTK4=1 env variable.

Thank you for the quick reply. Does this also apply to JUnit testing and SWT examples?

[akurtakov]

start the snipped with SWT_GTK4=1 env variable.

Thank you for the quick reply. Does this also apply to JUnit testing and SWT examples?

Yes, if the env variable is set SWT will try load GTK 4 libs and fallback to Gtk 3.x if loading 4.x fails.

[lathapatil]

I observed some test failures when SWT_GTK=1 was set for AllWidgetTests, eventually leading to a testcase that rendered Eclipse unresponsive and caused it to close.

Perhaps we should consider creating an issue to address these problems once somebody else confirm the behavior.

[akurtakov]

I observed some test failures when SWT_GTK=1 was set for AllWidgetTests, eventually leading to a testcase that rendered Eclipse unresponsive and caused it to close.

Perhaps we should consider creating an issue to address these problems once somebody else confirm the behavior.

I am not aware of anyone else looking into this so this could mean waiting indefinetely.

[jonahgraham]

Confirmed in HEAD of SWT + Ubuntu 25.04 + GTK4 4.18.4+ds-1

On GTK3 double click in the window gives this output:

DOWN: button: 1, stateMask=0x0, x=102, y=23
UP: button: 1, stateMask=0x80000, x=102, y=23 BUTTON1
DOWN: button: 1, stateMask=0x0, x=102, y=23
UP: button: 1, stateMask=0x80000, x=102, y=23 BUTTON1

And on GTK4:

DOWN: button: 1, stateMask=0x0, x=81, y=19
UP: button: 1, stateMask=0x80000, x=0, y=0 BUTTON1
UP: button: 1, stateMask=0x80000, x=0, y=0 BUTTON1

Note that in addition to the missing DOWN event, the UP events have incorrect x/y values.

[jonahgraham]

Since @Theo-Dann-Muirhead-Renesas is not a committer, I cannot assign this to him, so I have assigned it to me. He is looking at this now.

[laeubi]

@jonahgraham I think you can only assign people to an issue if they are either committers or participated in the discussion (e.g. added a comment).